Why do I have trouble pronouncing words and restricted voice due to mucus in throat?

Hello,

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As you have mentioned, your primary complaint is excessive mucus in the throat leading to you having trouble pronouncing words. Your voice gets better when you are eating, or have a runny nose, or on sucking a hard candy. All these things have one thing in common that they dilute the mucus ( eating, sucking a candy cause increased salivation, thereby diluting the mucus). That means you have a thick, sticky mucus interfering with your speech, which may be due to sinusitis, chronic pharyngitis, gastro-esophageal reflux disease or environmental factors like cigarette smoke or dust. If you have a tendency to frequently clear your throat, that may be a sign of chronic sinusitis. You may need to get a nasal endoscopy done. A clinical examination of the posterior wall of the pharynx may reveal mucosal changes, suggesting a diagnosis of chronic pharyngitis (due to any cause). The treatment will depend upon the cause. For example, chronic rhinosinusitis is treated with antibiotics, antihistaminics (like Cetirizine), nasal sprays, etc. Chronic pharyngitis is treated with (sometimes) antibiotics, throat gargles, antihistaminics, etc. A course of PPI (proton pump inhibitors) like pantoprazole is required to treat gastroesophageal reflux disease. Whatever may be the cause, important is to stay hydrated by drinking lots of water and avoiding dust or cigarette smoke, etc.